Product images: Amazon listings
Written from the listing's specs, not from our own use · How we rate
The 6699 Flushing Kit (1/4 HP Stainless Pump) is a flush kit built around a 1/4 HP pump and 6 ft hoses. It makes most sense for doing the annual flush yourself; we rate it 7.1/10 from its listing.
| Brand | 6699 |
|---|---|
| Category | Service kits, valves & parts |
| Pump | 1/4 HP, 1,500 GPH |
| Hoses | 6 ft |
| ASIN | B0FD392VTP |
Full listing title: 6699 Tankless Water Heater Flushing Kit Includes 1/4HP Stainless Steel Sump Pump with Two Adapters & 3 Gallons Pail with Bucket Lid Opener & Two 1/2” Dia X 6’ Hoses with Washers
Rated from the listing's specs, no buyer reviews yet
What it's made for: doing the annual flush yourself.
Two flush kits close to it on our rating, each with a dated price.
The pump the listing states, rated 1,500 GPH. It pushes the solution through the heat exchanger and back into the pail for about an hour; the hoses have to reach from the service valves down to the bucket.
Yourself: the kit gives you a 1/4 HP pump and 6 ft hoses, per the listing. With service valves on the heater, it's an hour with a bucket on the garage floor.
Book the plumber: if your heater has no service valves yet, the first visit is to put them in. After that, this kit does the yearly job.
What the 6699 Flushing Kit (1/4 HP Stainless Pump) listing names:
In the box, per the listing: A pump, Hoses, A bucket.
Hold the figures against your own heater and its manual before you order.
On Sep 30, 2026, that price put it around the middle of the 10 flush kits we have a recent price for.
The descaler isn't in the box, so add a bottle (or a few gallons of vinegar, if your manual allows it).
The button opens the exact listing (ASIN B0FD392VTP), where today's price, stock and seller apply.
Want the descaler in the box? The Chromex Flush Kit, Concentrated Vinegar (7.4/10) comes with it, per its listing.
Want to spend less? The FILGAUR Flushing Kit, Brushless Pump (7.1/10) was listed at $59.99 on Sep 30, 2026.
Our take
The 6699 Flushing Kit (1/4 HP Stainless Pump) is about a 1/4 HP pump and 6 ft hoses, and it doesn't pretend to be more. No buyer reviews yet, so the 6699 Flushing Kit (1/4 HP Stainless Pump) has to win you over on paper. The catch with this 6699 flush kit: without service valves on your heater, there is nothing to hook it up to. We'd pick the 6699 Flushing Kit (1/4 HP Stainless Pump) if you would rather flush it yourself than book a service call; otherwise, put it next to the Chromex Flush Kit (1 Gallon Solution) first.
Before the 6699 Flushing Kit (1/4 HP Stainless Pump) ships, check your service valves: its 1/4 HP pump needs isolation valves with service ports on your heater to connect to.
Most makers name the descaler or the vinegar they accept, and some warranties depend on it. Check before you pour.
Look under the heater for two valves with small side ports on the hot and cold lines. That is where the flush hoses attach.
A 1/4 HP pump, 6 ft hoses, a bucket and about an hour. Our flushing and descaling guide walks through the steps.
How the 6699 Flushing Kit (1/4 HP Stainless Pump) stacks up against the closest alternative, the Chromex Flush Kit (1 Gallon Solution).
| Criterion | 6699 Flushing Kit, 1/4 HP Stainless Pump | Chromex Flush Kit, 1 Gallon Solution |
|---|---|---|
| Our rating | 7.1/10 | 7.2/10 |
| Pump | 1/4 HP | 1/6 HP |
| Pail | Not stated | 5 gal |
| Solution included | Not stated | Stated |
Pick the Chromex Flush Kit (1 Gallon Solution) if you want our higher-rated option (7.2/10), with the solution in the box.
We rate it 7.1/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
Its listing states a 1/4 HP pump and 6 ft hoses. These are the seller's figures, not our measurements: whether it fits your exact heater is worth confirming first.
Your heater's manual: most makers name the descaler or the vinegar they accept, and some warranties depend on it. Check before you pour. Service valves: look under the heater for two valves with small side ports on the hot and cold lines. That is where the flush hoses attach. The setup: a 1/4 HP pump, 6 ft hoses, a bucket and about an hour. Our flushing and descaling guide walks through the steps.
We link to the exact listing on Amazon, where today's price, stock and seller apply. It is an affiliate link, and it has no effect on the rating.
No, we haven't used it ourselves. Everything on this page comes from its listing, read line by line and weighed with our published formula.